Historically Arrowhead Stadium, where the Cowboys play Sunday, is among the loudest in the NFL. It's always sold out. The fans are all in red. It's just L-O-U-D. For the last two weeks the Cowboys have piped in crowd noise during practice to simulate the stadium feel. Last week's stop, Invesco Field at Mile High, was loud too. And the fans in the upper deck stomp their feet, which rattles the press box below. That was interesting. Anyway, does piping in crowd noise work? "...